"I love the '70s; everyone knows it's my decade," Peter Dundas tells PORTER of his signature aesthetic for Roberto Cavalli. This gilded fil coupé gown is inset with panels of delicate lace that peak out from layers of black fringing. It's finished with airy bell sleeves and turns to show off a skin-baring back that's as revealing as the plunging neckline. Follow the runway and wear yours with the label's denim jacket.